Engineering Metrology Practice Test 7

1. What is the common range of wear in ring thread gauge?

0.0025mm - 0.0075mm

0.025mm - 0.05mm

0.025mm - 0.075mm

0.0025mm - 0.005mm

2. What is the relation between the effective diameter of a thread hole and an effective diameter of the screw in screw thread gauge?

maximum effective diameter of a thread hole must necessarily be greater than the minimum effective diameter of the screw

minimum effective diameter of a thread hole must necessarily be lesser than the maximum effective diameter of the screw

maximum effective diameter of a thread hole must necessarily be greater than the minimum effective diameter of the screw

minimum effective diameter of a thread hole must necessarily be greater than the maximum effective diameter of the screw

3. What will happen if plunger lifting lever released suddenly?

Distort rack teeth

Lever will break

Break the plunger

No effect

4. Which of the following is a criterion of a good bearing surface?

Negative skew

Negative peak roughness

Positive start up length

Positive skew

5. Which of the following is not true for the method of measurement of surface finish by micro interferometer?

Monochromatic source of light is used

Optical flat is used

Depth of defect can’t be measured

Interference lines plays an important role in identification of the defect

6. Which type of housing is used in the test indicator?

Split type

Detachable

Box type

Spherical

7. Which of the following is a problem in using dial gauges?

Gauge wear

Effect of temperature variation

Oscillation in the pointer

Economy

8. What is the magnitude of wear allowance in Go gauges in present British System?

One-third of gauge tolerance

One-fifteenth of gauge tolerance

One-fifth of gauge tolerance

One-tenth of gauge tolerance

9. What is the virtual change of effective diameter of bolt or nut in case of whitworth thread in terms of error in flank angle?

0.0105 X p(θ₁ + θ₂)

0.182 X p(θ₁ + θ₂)

0.1921 X p(θ₁ + θ₂)

0.0195 X p(θ₁ + θ₂)

10. Which of the following is the correct option for given statements about the effect of pitch error?
Statement 1: Pitch error can cause progressive tightening on assembly.
Statement 2: Tool work velocity ratio will play an important role to prevent pitch errors.

T, F

F, F

T, T

F, T